Vibration reduction of cables with pendulum-type elastic metamaterials

Yoon, Joo Young; Lim, Seungho; Yoo, Junsun; Park, No−Cheol

doi:10.1016/j.ijmecsci.2022.107169

Cited by 10 publications

(1 citation statement)

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“…Referring to the previously discussed defect-mode shape, we aimed to investigate the longitudinal displacement at the center of the defect. When imagining the experiment, it would be easier to measure the displacement in a non-contact way using a Laser Doppler Vibrometer rather than measuring the strain by attaching a strain gauge to the defect [35][36][37]. One point worth mentioning before the analysis was the consideration of two reference values.…”

Section: Resultsmentioning

confidence: 99%

Impact of Input Signal Characteristics on Energy-Localization Performance of a Phononic Crystal with a Defect: A Comparative Study of Burst and Continuous Wave Excitation

2023

Crystals

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This study examines the energy-localization performance of a one-dimensional phononic crystal (PnC) with a defect when exposed to burst waves of different cycle numbers under longitudinal waves. Using the finite element method, band structures of the defect-introduced PnC were calculated, revealing a phononic band-gap range, defect-band frequencies, and corresponding defect-mode shapes. The transient analysis examined the longitudinal displacement at the center of this defect in the time domain for various burst-wave scenarios. The results indicate that energy-localization performance inside the defect highly depended on the number of cycles. Energy-localization performance was better with larger cycles or continuous waves, although burst waves with a small number of cycles also showed some improvement, albeit limited. Moreover, burst waves with a small number of cycles did not clearly induce fixed-like boundary conditions (in other words, nodal points in standing waves) within the defect-introduced PnC, leading to obscure energy-localized behaviors. Key messages from this work can be summarized as follows. First, comparing the energy-localization performance under incident burst waves with different cycle numbers for different systems might not be appropriate. Second, the physically reasonable formation of defect-mode-enabled energy localization requires burst waves with a large (in the case study, over 500) number of cycles.

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Section: Resultsmentioning

confidence: 99%